What will be the amount of heat change at constant pressure? a) 223.53 cal b) 371.25 Cal c) 155.8 Cal d) 355.68 Cal 22. What will be the amount of work done in the process ? a) -62.32 Cal b) -140.925 Cal c) -142.27 Cal d) -148.5 Cal Matrix Matching Type Questions 23. Column-I Column-II A) Reversible cooling of an ideal gas at constant volume B) Reversible isothermal expansion of an ideal gas P) w= 0; q < 0; AU < 0 Q) w < 0, q> 0, AU > 0 R) w= 0; q = 0; AU = 0 S) w < 0; q> 0; AU= 0 C) Adiabatic expansion of non-ideal gas into vacuum D) Reversible melting of sulphur at normal melting point Integer Type Questions 24. Among heat capacity, molar heat capacity, molarity, molality, mole fraction, specific heat, the number of extensive properties are ? 25. In the present graph, the area of circle A and B are 25 unit and 20 unit respectively work done will be 5x, units. x = 26. 1L of NH, at 27C is expanded adiabatically to x litres and final temperature is-123C. What is the value of x ? 27. Calculate the work done by the system in an irreversible (single step) adiabatic expansion of 2 mole of a polyatomic gas (Y = 4/3) from 300 K and pressure 10 atm to 1 atm : (in KJ) (round off to closest integer) EXERCISE-II (Different types of heats of reactions, Hess Law of constant heat summation. Bond enthalpy energy) LEVEL-I (MAIN) Straight Objective Type Questions When a reaction is conducted in an open vessel, the heat of reaction is represented as 1) 3) V 4) A nRT 2) AE The factor which does not influence the heat of the reaction is 1) Pressure 2) Temperature 4) Number of steps involved in the reaction 3) Physical state of substance Assertion (A) : The enthalpies of elements in their standard states are taken as zero. Reason (R) 2) A and R are true, R does not explain A 4) A is false, but R is true It is impossible to determine the absolute enthalpy of any substance. 1) A and R are true, R explains A 3) A is true, but R is false 119 OUudonts